# Complete project details at https://RandomNerdTutorials.com

from machine import Pin, ADC, SoftI2C
import ssd1306
from time import sleep

#Librerias de conexion
#Cleinte mqtt, wifi
import network
from umqtt.simple import MQTTClient

#Definir constantes para hacer uso de MQTT clietnes
MQTT_BROKER = 'broker.hivemq.com'
MQTT_USER = ""
MQTT_PASSWORD = ""
MQTT_CLIENT_ID =""
MQTT_TOPIC = "utng/vjov/gas"
MQTT_PORT = 1883

#Metodo para conexion a wifi
def wifi_connect():
  print("Trying conecction...", end="")
  sta_if = network.WLAN(network.STA_IF)
  sta_if.active(True)
  sta_if.connect("Wokwi-GUEST", '')
  while not sta_if.isconnected():
    print(".", end="")
    sleep(0.3)
  print("Conecction active")

def subscribe():
  client = MQTTClient(
    MQTT_CLIENT_ID,
    MQTT_BROKER,
    port=MQTT_PORT,
    user = MQTT_USER,
    password = MQTT_PASSWORD,
    keepalive = 0
  )
  client.connect()
  client.subscribe(MQTT_TOPIC)
  print("is conected to: %s at topic %s", MQTT_BROKER, MQTT_TOPIC)
  return client



def public(sensor_value):
  client = MQTTClient(
    MQTT_CLIENT_ID,
    MQTT_BROKER,
    port=MQTT_PORT,
    user = MQTT_USER,
    password = MQTT_PASSWORD,
    keepalive=0
  )
  client.connect()
  print("[OK]")
  client.publish(MQTT_TOPIC, str(sensor_value))
  print("is published to: %s at topic %s value = %s", MQTT_BROKER, MQTT_TOPIC, sensor_value)

  


# ESP32 Pin assignment 
i2c = SoftI2C(scl=Pin(22), sda=Pin(21))

# ESP8266 Pin assignment
#i2c = SoftI2C(scl=Pin(5), sda=Pin(4))

oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)


#Variables de leds
led_verde = Pin(12, Pin.OUT)
led_rojo = Pin(13, Pin.OUT)
sensor = ADC(Pin(32))
#Ajustar Resolucion y el voltaje 
sensor.width(ADC.WIDTH_10BIT) #regular pa precision del sensor
sensor.atten(ADC.ATTN_11DB) #Trabajamos con 3.3V


wifi_connect()

#ciclo infinito 
while True:
  #Lee el valor del senor
  lectura = sensor.read()
  #limpia la pantalla
  oled.clear()
  if lectura > 200:
      led_verde.value(0)
      led_rojo.value(1)
      oled.text('Alerta CO Higth', 0,32)
  else:
      led_verde.value(1)
      led_rojo.value(0)
      oled.text('CO Normal',0,32)
  oled.show()
  #Se publica el valor de sensor
  public(lectura)
  oled.hw_scroll_h()
  sleep(5)